interface Foo {
  bar?: string;
  num?: number;
}

function getFoo(): Foo {
  return {
    bar: 'bar',
    num: Number.MAX_VALUE
  };
}
const foo: Foo = getFoo();
export const isEqualsBar = foo.bar === 'hello';

a == b!;

a = b!;

a !== b;

a != b;

(a + b!) == c;

(a + b!) = c;